Split pulley.



No. 781,768. PATENTED PEB. 7, 1905. J. DONOVAN.

SPLIT PULLBY.

APPLICATION FILEDMARJB, 1903.

2 SHEETS-SHEET 1.

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PATBNTED FEB. 7, 1905.

J. DONOVAN.

SPLIT PULLEY.

APPLIUATION FILED MAB. 1e, 1903.

2 SHEETS-SHEET Z.

Patented February 7, 1905.

PATENT Fries.

AMES DONOVAN, OF THREE RIVERS, MICHIGAN.

SPLIT PULLEY.

SPECIFICATION forming part of Letters Patent No. 781,768, dated February 7, 1905.

Application filed March 16, 1903. Serial No. 148,012.

To {rf/ w/m'm/ 'it 'ntrty/ concern:

Be it known that l, Janes DONOVAN, a citi- Zen of the United States` residing' at lhree Rivers, in the county of St. Joseph and State of Michigan, have invented certain new and useful Improvements in Split Pulleys,of which the following is a specification, reference being had therein to the accompanying' drawings.

lt is the object of the invention to obtain a construction of pulley in which the rim and supporting-web therefor are formed from a single sheet-metal blank and the hub is formed of cast metal.

It is a Vfurther object to brace the rim from the hub on both sides of the center; further, to so unite the hub and web as to firmly secure the same together without unduly straining' the cast metal; further, to so east the hub that it will be severed by reaming out the center thereof.

To facilitate a full and clear understanding' of the invention, my novel method of forming' the pulley will be herein referred to, but not claimed, inasmuch as the same more properly constitutes subject-matter for a divisional application.

ln the drawings, Figure 1 is a plan of the sheet-metal blank from which the pulley is formed. Fig'. 2 is a diagrammatic section of said blank after the first operation. Fig. 3 is a similar View after the second operation. Fig. 4: a plan of the blank after the operation of punching'. Fig. 5 is a perspective View of the portion of the rim, showing the manner of Vforming the securing means for the separable sections thereof. Fig. 6 is a section through the blank,showing another Operation. Fig. T is a plan illustrating' the operation of forming the hub. Fig'. 8 is a section of Fig. T. Fig. 9 is a section through the pulley after the forming of the hub thereon, illustrating the manner of securing' the outer ends of the loose spokes. Fig. l() is a plan showing' the manner of severingl the pulley. Fig'. 11 is a section through the rim, showing' the means for clamping the severed ends of the sections tog'ether.

Heretofore wheels have been formed by striking' u p sheet-metal blanks so as to produce an integ'ral rim and supportingcenter- Such constructionsare not, however,adapted foruse as split pulleys, for the reason that the strength of the wheel depends upon the bracing' effect of the integral rim,and if this rim is severed the structure is weakened. liurthermore, it is obliectionable to attach securing devices for the rim by rivets, and it is also objectionable to cut away any portion of the rim` so as to leave a permanent opening' therein. Another objection to the use of sheet-metal construction of wheels as heretofore devised for split pulleys is that union between the sheet metal and the cast hub has been defective. For instance, in one method used the sheet-metal web is perforated and the hub is cast upon opposite sides thereof, the metal running through the perforations to unite the two sections. Such a construction is weak, as the molten metal filling' the perforations is chilled and is also strained by the expansion of the surroumling sheet metal. lVith the present invention these objections are overcome, first, by providing means for securely uniting' the severed ends of the rim, and, second, by the novel manner of casting the hub.

The method of manufacture is as follows:

A ycircular sheet-metal blank A is lirst eut, the radius of the blank being substantially equal to the radius of the finished wheel plus the width of the rim. This blank is lirst struck up, as shown in Fig. '2, to form the inclined annular flange fr and llat center L. In the second operation the flange u is tm'ned to extend perpendicular to the plane of the portion and the latter is inwardly dished, so that the center portion c thereof is substantially in the central plane of the rim. The blank thus formed is then cut by suitable dies to sever therefrom a se ries of radial wedge-shaped sections with intervening portions e of similar form. The rim or flange u is also punched upon diametrically opposite portions thereof to strike inward the pairs of earsf, the ears of each pair being' separated from each other by an uncut portion 1/ of the flange. '.lhe central portion of the web 'is also struck out to form an enlarged aperture y'. The severed sections (l are next arranged opposite the unsevered portion f and oppositely inclined IOO therefrom, so that their outer ends will bear against the opposite edge of the rims a, as shown in Fig. 6. An annular' flask Bis then placed around the center portion of the web,

said flask having projections la, which extend into the spaces formed by the removal of the section (Z. Metallic segments C are placed between the oppositely-inclining portions d and e and within the flask, so as to complete the circle thereof. A sand mold is then made by means of suitable hub-section patterns, and after the mold is formed and the pattern removed, as shown in Fig. 8, division-plates D are placed therein, said plates being preferably provided with transverse cores E, arranged as shown in Fig. 7. The plates D are placed in a plane indicated by the dotted line :e Fig. 4, which passes centrally between the pairs of inwardly struck ears f. The apertures formed by the removal of the sections Z in that plane are preferably inwardly elongated at 1', so as to permit of extending the division-plates- D inward into the aperture g. i

The next operation is the casting of the hub, and it is to be observed that in this operation the molten metal passes through the central aperture f/ in the web and also through each of the apertures formed by the removal of the sections d. As a consequence an integral tubular portion j', extending completely through the hub, is formed and an outer annular'portion 70, completely encircling the hub between the portions (l and e and extending through the intervening spaces. These portions are also integral with the portions Z and m, arranged upon opposite sides of the uncut portions n of the web. As a result the cast metal completely encircles the portion n between the aperture g and the wedge-shaped apertures, and the flange of the metal iirmly clamps the parts together.

The next operation is to turn in the edge of flange a, as shown in Fig. 9. This may be accomplished by spinning the wheel or in any other suitable way. The turned iiange 0 bears against the outer ends of the portions d, so as to form of the latter spokes or braces for supporting the flange. The wheel is next chucked, and the core-aperture in the hub is reamed out sufficiently not only to true the same, but to sever the slight thickness of cast metal p at the inner end of the severing-plates D. Thus the hub will be separated into two sections, which are spaced from each other by the thickness of the plate D. The rim of the Wheel is then sawed in the same plane, which completely severs the wheel. The severed sections are next reunited by securing devices of the following construction:

F and F are two similar clamping members, which at their outer ends are of a shape to exactly fit in the apertures q, formed in the rim by the striking-in of the ears f. These members extend inward adjacent to the ears f and at their inner ends are turned to abut against each other at r. These members are further provided with apertures s, which are arranged in alinement with the apertures formed in the ears f. A bolt G is then passed through the alined apertures, and a nut H is engaged therewith to clamp the members F Fl and the ears f together. The abutting ends u of the rimsections will thereby be firmly clamped together, while the apertures q will be filled.

The final operation is the turning of the wheel, which is accomplished by clamping the hub-sections upon a mandrel by means of bolts passing through the apertures formed by the cores E. These apertures are formed in ears n upon opposite sides of the hub. The outer face of the rim is then turned off to produce a true surface, and at the same time the outer ends of the members F and F are cut to form complementary sections of the trued surface.

The pulley formed in the manner and of the construction described may be readily attached or detached from a shaft, and when the parts are clamped together the structure is practically as strong as before severing. If desired, the bolts G may be provided with additional nuts J, which are arranged between the ears f and clamp the bolt permanently to one of the members.

Vhat I claim as my invention isl. A Wheehcomprising an integral sheetmetal rim and web, said web being inwardly dished and having a centrally-disposed aperture and plurality of apertures surrounding said central apertures and a hub comprising a tubular bearing portion extending through the central aperture in the web, an outer portion extending through the apertures surrounding said central aperture, and intermediate portions clamped by said outer and inner portions upon opposite sides of the web.

2. A Wheel comprising an integral sheetmetal rim and web, said web being inwardly dished, a brace member having its inner end adjacent the inner portion of the web and its outer end bearing against the opposite edge of the rim and a hub embedding the adjacent edges of the web and brace member.

3. A split pulley com prising separable sheet-metal sections,each having a rim-section and an inwardly-extending supporting-web formed of a single piece of sheet metal, a plurality of braces extending from the inner edges of said supporting-webs to the opposite edges of said rim-sections, and complementary hubsections embedding the adjacent edges of the braces and the web-sections.

4. A wheel comprising an integral sheetmetal rim and web, said Web being inwardly dished, a brace member having its inner end adjacent the inner edge of the web and its outer end bearing against the opposite edge of the rim, and a hub embedding the adjacent IOO IOS

IIS

edges of the brace member and web, the edge ot the rim being turned inward to secure the outer ends of said sections.

5. A split pulley, comprising a rimportion et' sheet-metal Vformed in separable sections, there being portions at the adjacent ends of said sections forming ears, and a clamping device for said sections being' secured to said ears and filling the spaces vacated thereby.

A split pulley comprising a rim portion of sheet metal formed in separable sections, there being portions at the adjacent ends of said sections forming ears and having an uncut portion forming a draWing-shoulder, and a clamping-head for each of said ears filling the aperture left thereby in the rim, and being adapted to draw upon said shoulder to secure the sections together'.

T. A split pulley, comprising a rim portion ot' sheet metal Aformed in separable sections, there being portions at the adjacent ends of said sections forming ears, and an uncut portion ot' the rim at the base of each ear forming a drawing-shoulder, and a clamping member for each ear, comprising a portion filling the aperture in the rim and inwardly-extending portion adjacent the said ear, and an innermost portion abutting against the adjacent member, and a screw passing through said clamping members and ears, whereby said sections may be securely drawn together.

8. A sheet-metal pulley comprising separable sheet-metal sections, each having a rimsection, an integral web extending' inwardly from one edge of said rim-section, a hub-section secured to the inner edge ot' the web, and a brace having its inner end secured to the hub-section and its outer end secured to the free edge of the rim-section.

9. A split pulley comprising separable rim-sections formed`of sheet metal, the adjacent ends of said sections having struclvin portions forming ears and a clamping device for said sections secured to said ears and having portions lilling the spaces in the rim-sections vacated thereby.

ln testimony whereotl .l atlix my signature in presence of two witnesses.

JAMES DONOVAN.

NVitnesses:

G. U. LATOUR, ROSA LEoNn MORGAN. 

